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1、紧固件制造 Packing FastenerManufactureProcess Withoutmachining Page 2 RawMaterial Page 3 RawMaterial Designatedareafordifferenttypesofsteel Page 4 Typesofsteelindicatedbycolour RawMaterial Page 5 Tagsshowing Themanufacturer Theheatnumber Thedimension Theweight TheCarboncontent RawMaterial Page 6 WireMate
2、rialControl Wirediameter Generalaspect Hardness Hardenability UTS Decarbon RawMaterial Page 7 RawMaterial Page 8 Phosphatingbath RawMaterial BathscontrolRegularcleaning Page 9 Phosphatedwires Page 10 Wirecalibration RawMaterial Page 11 Page 12 ColdHeading HotForging Page 13 HexHeadCapScrewForgingSeq
3、uence 4Stn CUTOFFSTN 1STSTN 2NDSTN 3RDSTN 4THSTN ColdHeading Page 14 Page 15 Page 16 ColdHeading Page 17 Page 18 ColdHeading Page 19 ColdHeading Page 20 Inprocesscontrol ColdHeading Page 21 HotForging Page 22 HotforgingBarsheating HotForging Page 23 HotForging Over25mmDiameter Page 24 ThreadRolling
4、Page 25 THREADSROLLING APROCESSOFFORMINGTHREADSWITHOUTREMOVINGTHEMATERIAL ThreadRolling Page 26 1Flatrollingdies2Segmentalrotaryrollingdies3Tworollsonesupportingledge4Threerolls ThreadRolling Page 27 FLATTHREADROLLING Formoderateproduction CG1 2 4 partly 5 9 10 11 12 90 productsfromcatalogue ThreadR
5、olling Page 28 Page 29 CIRCULARTHREADROLLING CIRCULARROLLINGDIE2NOS Lowproductionrate suitableforOddheadshapeCG4 e g BN253 256 276 278 258 aboveM24 criticalautoparts ThreadRolling Page 30 Threadrollingafterheattreatment Horizontalthreadrollingismainlyusedtoformthreadafterheattreatment processisveryp
6、recisebutslowandnotfitforlargequantities ThreadRolling Page 31 Page 32 SEGMENTALCIRCULARTHREADROLLING CIRCULARROLLINGDIE2NOS STATIONARYDIE ROTATINGDIE 3TO4PIECESATATIME ForM cscrews CG5 ThreadRolling Page 33 PlanetaryThreadrolling Page 34 Threadrolling Setupthreadrolling 5samplesarecheckedbyQC Page
7、35 In processcontrol5samples 15mn Norecord Recordedvalues every1hour min max Page 36 HeatTreatment Page 37 LPS HEATTREATMENT ACOMBINATIONOFHEATING COOLINGOPERATIONSTOOBTAINDESIREDPROPERTIES HeatTreatment Page 38 HEATING HEATINGTHEMATERIALABOVEAUSTENISATIONTEMPERATURE SOAKINGASPERCROSSSECTION QUENCHI
8、NG RAPIDCOOLINGOFAUSTENISEDMATL IMMERSINGINOILORWATER MARTENSITICTRANSFORMATIONRESULTINGINTOINTERNALSTRESSES HeatTreatment For8 8andabove820to900DegreeC Page 39 LPS TEMPERING HeatingHardenedmaterialtospecifictemp muchbelowaustenisationtemp forspecificdesiredproperties ImmediatelyafterQuenching REDUC
9、ESINTERNALSTRESSES ALSOREDUCESHARDNESS HEATTREATMENTPROCESSFOR8 8 ABOVE 450 10DegreeC Page 40 Fastenersofvariousgradesmadeoutofdifferentsteels Atroomtemp theMaterialisinPearlite Lamellar Spherodised ferriteform Quenching FastCooling HardMartensite accicular Structure Brittle notsuitableforuse Tempering TemperedMartensiteStructure productsuitableforuse FurnaceHavingthreezones ControlledatmosphereofendoGasavailablefromgasgenerator crackedgas LPG Air 1 10 Heatingtoaustenisingtemp of820to900degreeC temp controllersprovided 1 2 3 HEATTREATMENTPROCESSFLOWCHART Page 41 CDJohn Page 42
